update readme

README.md

@@ -46,17 +46,15 @@ Loose naming convention for toolchains:
 	- Ubuntu/Debian: (To be added)
 
 	- Arch:
-		```
+		`
 		sudo pacman -S avr-binutils avr-gcc avr-gdb avr-libc avrdude
-		```
+		`
 
 	- Gentoo:
 		- Install via [crossdev](https://wiki.gentoo.org/wiki/Crossdev):
-		```
+		`
 		crossdev -s4 --stable --portage --verbose --target avr
-		```
-
-
+		`
 
 #### OpenOCD